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Some people ignore tiredness for months before asking for help
While the NIH does not specify a tolerable upper intake level for vitamin B12, a study published in the JAMA Network Open found that high intakes of vitamin B12, such as from daily supplementation of 25 micrograms or higher, increased the risk of bone fracture [3] [4]
Seeing that sort of experience, even for a doctor, stays with you, says Heber
This is because the fetus needs vitamin B12 to develop normally, and those needs are met through placental absorption
Pernicious anemia, which rarely shows up before age 60, is treated with prescription strength vitamin B12
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